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 Post subject: A600 vs: R600
PostPosted: Jul Thu 18, 2019 2:49 am 
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Joined: Feb Wed 27, 2019 9:51 pm
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Location: Medford, Or.
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...Who knows the difference between a T.O. A600 and a T.O. R600 ? They sure look the same to me.


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 Post subject: Re: A600 vs: R600
PostPosted: Jul Thu 18, 2019 4:56 am 
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Joined: Feb Wed 27, 2019 9:51 pm
Posts: 262
Location: Medford, Or.
..9 mhz on A,B600, 8 mhz on L,R600, and L,R600 has the 50a1 ballast. That's what I found, so far.

..Anyone know of a resource of all the little differences, short of buying that famous Zenith book ?


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 Post subject: Re: A600 vs: R600
PostPosted: Jul Thu 18, 2019 6:27 am 
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Joined: Sep Sat 27, 2014 4:24 am
Posts: 1878
Location: Oxford, MI
The Zenith Trans-Oceanic 600 series was produced from 1954-1962 with several different letter prefixes L600, R600, T600, Y600, A600 and B600.

A few minor circuit changes occurred throughout production of these 600 models, but for the most part changes were physical and minor. All use the same tube lineup (including the 50A1 ballast) and have the slide rule type dial.

The L600 was the first model and is distinguishable in that the headphone jack was still located on the back of the chassis and the front panel had no cut out for it.

The R600 relocated the headphone jack to the front panel next to the dial light switch where it remained for the rest of production.

The T600 added a phono input and switch to the back of the chassis.

The Y600 seems to be the same externally as the T600. (I would be interested in knowing if there are any external differences in this and the T600 from anybody that owns both).

The A600 expanded the band coverage from 4-8Mc to 4-9Mc and added cutouts in the top of the cabinet so that the suction cups could remain attached to the Wave-Magnet when it was replaced in the cabinet but the storage snaps on the back door of the cabinet for the suction cups remained.

The B600 removed the storage snaps on the back door of the cabinet for the suction cups.

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Hunter

Caretaker of Portable Tube Radios


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 Post subject: Re: A600 vs: R600
PostPosted: Jul Thu 18, 2019 6:39 am 
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Joined: Feb Wed 27, 2019 9:51 pm
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Location: Medford, Or.
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...Interesting. I appreciate your contribution. :D


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 Post subject: Re: A600 vs: R600
PostPosted: Jul Fri 19, 2019 8:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9838
Location: Beaver Falls, PA. USA
On Zenith products in the 1950s, the prefix letter indicates the model year.

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Tim KA3JRT


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 Post subject: Re: A600 vs: R600
PostPosted: Jul Sat 20, 2019 10:45 pm 
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Joined: Dec Tue 23, 2014 6:51 pm
Posts: 2032
Location: N. Palm Bch, Fl.
I think Zenith changed the lettering when there was a major change. The A600 stuck around for a while. As Compton79 said. The one we really don't understand is from T to Y. Very little info between them.
I did find this. The Zenith Transoceanic Tube Model Lineup 1951-62.
Y600 - The Y600 introduced in 1957, appears identical to the previous version, but uses the 6T40Z chassis - the case lid will be stamped 'Model Y600.
I take that to mean that the two chassis T and Y are different some how.

I just found this in the Royalty of Radios.
" The Y600 used the 6T40 and 41 chassis from the T600 with modifications to the power supply."
I wounder what that could be.

Freeman


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 Post subject: Re: A600 vs: R600
PostPosted: Jul Sat 20, 2019 11:32 pm 
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Location: Oxford, MI
I did not previously bother to check the individual schematics for each model as normally there is a capacitor value change or something minor. But since the question has been asked in more detail, I did check those for the T600 and Y600. The largest change that I can note is in the power supply as previously mentioned by Freeman and is a transition from a slide type AC/battery changeover switch on the T600 to a rotary type on the Y600.

Attachment:
T600 PS (800x449).jpg
T600 PS (800x449).jpg [ 227.31 KiB | Viewed 1001 times ]


Attachment:
Y600 PS (800x448).jpg
Y600 PS (800x448).jpg [ 196.65 KiB | Viewed 1001 times ]

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Hunter

Caretaker of Portable Tube Radios


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 Post subject: Re: A600 vs: R600
PostPosted: Jul Sun 21, 2019 3:02 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9838
Location: Beaver Falls, PA. USA
The chassis number is the key. Zenith indicated the model year as the letter in the chassis number, and sometimes carried the same number two years in a row. However, any modifications to the original design were indicated by a "Z" at the end of the chassis number. A major change would call for a different number.

As the 600 series of the Transoceanic was made for several years, there was some evolution in the design.

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 Post subject: Re: A600 vs: R600
PostPosted: Jul Wed 24, 2019 11:01 pm 
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Joined: Feb Wed 27, 2019 9:51 pm
Posts: 262
Location: Medford, Or.
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...good info. Thanks, much. I haven't started this latest R600, but will find out before long.
.
...Been having a devil of a time with a "junk" 6G801, but the light at end of tunnel is slightly viewable. What a hodge-podge of linkage, and the chassis was a disastor, that an "expert" tried to fix. Got the radio playing good, but might be slightly muddy. My ears aren't the best, these days. Anyway, I definitely have too much money into this thing. :oops: :roll:


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